To Visualize Smaller and Lower Contrast Objects During Interventional Procedures,high

To visualize smaller and lower contrast objects during interventional procedures,high level control fluoroscopy uses exposure rates that are ____________ those normally used in routine fluoroscopy.

A) higher than
B) lower than
C) the same as
D) None of the above,because smaller and lower contrast objects cannot be visualized by fluoroscopy during interventional procedures.